Merge pull request #3 from SESA258801/DSS_User_Guide

Dss user guide
Fix Travis descriptor according to the new file tree
Merge pull request #4 from SESA258801/DSS_User_Guide

Defined global-extensions as an assembly module
Erroneous "dependencies" -> "modules"
Fix assembly: dependencySet -> moduleSet + assembly-plugin version
Finalized DSS User Guide